Iri 108 



Iridescent. — Exhibiting prismatic colours, like 

 those of the rainbow. (L.^ — Gr. L, iris — Gr. 

 iris, iridis, the rainbow. Der, irid-esc-ent, 

 irid-ium ; from irid-, stem of iris.) 



Iridicolorous. — Reflecting prismatic hues, irid- 

 escent. (Gr. iris, and L. color.) 



Iris. — The circle of colour which encloses the pwpil 

 of an eye of colour. (Gr. iris, iridis, the rain- 

 bow.) 



Iris tapetum. — [See Pigment.] 



Irregular [irregN lares). — (Antennae). Having all 

 the joints different in shape. (L. in, and 

 regularis, according to rule.) 



Irrorate, Irrorated. — Freckled ; covered with atomi. 

 (L. irroro, are, to bedew, drop upon.) 



Islet. — A spot of different colour, included in a 

 plaga, or macula. (Fr. He, from L. insula.) 



Johnstonian organ. — A peculiar organ existing in 

 the second antennal joint, and consisting of a 

 number of sensillse and scolopal bodies ; the 

 former being stretched through the cavity of 

 this joint and attached by the distal ends to 

 the articulatory membranes of the second and 

 third joints, while the proximal ends are inner- 

 vated by the antennal nerve. 



Jubate. — Fringed with long pendent hairs ; ex. the 

 intermediate legs of the male of Anthophora 

 retusa. (L. juha, ce, mane, hair, tuft, crest.) 



